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Merge bitcoin/bitcoin#24391: build: stop overriding user autoconf flags

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7b00595d33 build: stop overriding user CXXFLAGS (fanquake)
3e2ef23c3e build: stop overriding user LDFLAGS (fanquake)
35c3fd43c3 build: stop overriding user CPPFLAGS (fanquake)
bc7cc57607 doc: explain why we clear CXXFLAGS with enable-debug (fanquake)

Pull request description:

  Historically our build system has hijacked `CXXFLAGS` and friends, and this has always been a source of complaints from users and developers. With this PR, we move away from using `CXXFLAGS`, `CPPFLAGS` and `LDFLAGS`, and instead use `CORE_*FLAGS` variables for our flags / options, leaving autoconfs `FLAG` vars to the user.

  Note that there are currently two cases where we will at least clear `CXXFLAGS` (if not alreaddy overridden by the user), when doing debugging or when coverage is enabled, to avoid Autoconfs `-g -O2` CXXFLAG default.

ACKs for top commit:
  hebasto:
    ACK 7b00595d33

Tree-SHA512: bda936a7aa8f98a1bf1552306845cb4bbab54e19a7a0b9ce3210e10fef70db146e9fe42a0cc8c50b2908506771b5b96f39c334e41323b70ec878e4010373096c
This commit is contained in:
fanquake 2022-04-05 09:18:20 +01:00
commit 0baf6aded5
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GPG key ID: 2EEB9F5CC09526C1
3 changed files with 45 additions and 34 deletions
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10
build-aux/m4/bitcoin_qt.m4
View file

@ -116,8 +116,8 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
BITCOIN_QT_CHECK([
TEMP_CPPFLAGS=$CPPFLAGS
TEMP_CXXFLAGS=$CXXFLAGS
CPPFLAGS="$QT_INCLUDES $CPPFLAGS"
CXXFLAGS="$PIC_FLAGS $CXXFLAGS"
CPPFLAGS="$QT_INCLUDES $CORE_CPPFLAGS $CPPFLAGS"
CXXFLAGS="$PIC_FLAGS $CORE_CXXFLAGS $CXXFLAGS"
_BITCOIN_QT_IS_STATIC
if test "$bitcoin_cv_static_qt" = "yes"; then
_BITCOIN_QT_CHECK_STATIC_LIBS
@ -178,8 +178,8 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
AC_MSG_CHECKING([whether -fPIE can be used with this Qt config])
TEMP_CPPFLAGS=$CPPFLAGS
TEMP_CXXFLAGS=$CXXFLAGS
CPPFLAGS="$QT_INCLUDES $CPPFLAGS"
CXXFLAGS="$PIE_FLAGS $CXXFLAGS"
CPPFLAGS="$QT_INCLUDES $CORE_CPPFLAGS $CPPFLAGS"
CXXFLAGS="$PIE_FLAGS $CORE_CXXFLAGS $CXXFLAGS"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <QtCore/qconfig.h>
#ifndef QT_VERSION
@ -201,7 +201,7 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
BITCOIN_QT_CHECK([
AC_MSG_CHECKING([whether -fPIC is needed with this Qt config])
TEMP_CPPFLAGS=$CPPFLAGS
CPPFLAGS="$QT_INCLUDES $CPPFLAGS"
CPPFLAGS="$QT_INCLUDES $CORE_CPPFLAGS $CPPFLAGS"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <QtCore/qconfig.h>
#ifndef QT_VERSION

63
configure.ac
View file

@ -361,7 +361,9 @@ case $host in
esac
if test "$enable_debug" = "yes"; then
dnl Clear default -g -O2 flags
dnl If debugging is enabled, and the user hasn't overriden CXXFLAGS, clear
dnl them, to prevent autoconfs "-g -O2" being added. Otherwise we'd end up
dnl with "-O0 -g3 -g -O2".
if test "$CXXFLAGS_overridden" = "no"; then
CXXFLAGS=""
fi
@ -468,7 +470,7 @@ if test "$CXXFLAGS_overridden" = "no"; then
fi
dnl Don't allow extended (non-ASCII) symbols in identifiers. This is easier for code review.
AX_CHECK_COMPILE_FLAG([-fno-extended-identifiers], [CXXFLAGS="$CXXFLAGS -fno-extended-identifiers"], [], [$CXXFLAG_WERROR])
AX_CHECK_COMPILE_FLAG([-fno-extended-identifiers], [CORE_CXXFLAGS="$CORE_CXXFLAGS -fno-extended-identifiers"], [], [$CXXFLAG_WERROR])
enable_sse42=no
enable_sse41=no
@ -617,7 +619,7 @@ CXXFLAGS="$TEMP_CXXFLAGS"
fi
CPPFLAGS="$CPPFLAGS -DHAVE_BUILD_INFO"
CORE_CPPFLAGS="$CORE_CPPFLAGS -DHAVE_BUILD_INFO"
AC_ARG_WITH([utils],
[AS_HELP_STRING([--with-utils],
@ -699,7 +701,7 @@ case $host in
AC_MSG_ERROR([windres not found])
fi
CPPFLAGS="$CPPFLAGS -D_MT -DWIN32 -D_WINDOWS -D_WIN32_WINNT=0x0601 -D_WIN32_IE=0x0501 -DWIN32_LEAN_AND_MEAN"
CORE_CPPFLAGS="$CORE_CPPFLAGS -D_MT -DWIN32 -D_WINDOWS -D_WIN32_WINNT=0x0601 -D_WIN32_IE=0x0501 -DWIN32_LEAN_AND_MEAN"
dnl libtool insists upon adding -nostdlib and a list of objects/libs to link against.
dnl That breaks our ability to build dll's with static libgcc/libstdc++/libssp. Override
@ -710,7 +712,7 @@ case $host in
postdeps_CXX=
dnl We require Windows 7 (NT 6.1) or later
AX_CHECK_LINK_FLAG([-Wl,--major-subsystem-version -Wl,6 -Wl,--minor-subsystem-version -Wl,1], [LDFLAGS="$LDFLAGS -Wl,--major-subsystem-version -Wl,6 -Wl,--minor-subsystem-version -Wl,1"], [], [$LDFLAG_WERROR])
AX_CHECK_LINK_FLAG([-Wl,--major-subsystem-version -Wl,6 -Wl,--minor-subsystem-version -Wl,1], [CORE_LDFLAGS="$CORE_LDFLAGS -Wl,--major-subsystem-version -Wl,6 -Wl,--minor-subsystem-version -Wl,1"], [], [$LDFLAG_WERROR])
;;
*darwin*)
TARGET_OS=darwin
@ -748,20 +750,20 @@ case $host in
if test "$use_upnp" != "no" && $BREW list --versions miniupnpc >/dev/null; then
miniupnpc_prefix=$($BREW --prefix miniupnpc 2>/dev/null)
if test "$suppress_external_warnings" != "no"; then
CPPFLAGS="$CPPFLAGS -isystem $miniupnpc_prefix/include"
CORE_CPPFLAGS="$CORE_CPPFLAGS -isystem $miniupnpc_prefix/include"
else
CPPFLAGS="$CPPFLAGS -I$miniupnpc_prefix/include"
CORE_CPPFLAGS="$CORE_CPPFLAGS -I$miniupnpc_prefix/include"
fi
LDFLAGS="$LDFLAGS -L$miniupnpc_prefix/lib"
CORE_LDFLAGS="$CORE_LDFLAGS -L$miniupnpc_prefix/lib"
fi
if test "$use_natpmp" != "no" && $BREW list --versions libnatpmp >/dev/null; then
libnatpmp_prefix=$($BREW --prefix libnatpmp 2>/dev/null)
if test "$suppress_external_warnings" != "no"; then
CPPFLAGS="$CPPFLAGS -isystem $libnatpmp_prefix/include"
CORE_CPPFLAGS="$CORE_CPPFLAGS -isystem $libnatpmp_prefix/include"
else
CPPFLAGS="$CPPFLAGS -I$libnatpmp_prefix/include"
CORE_CPPFLAGS="$CORE_CPPFLAGS -I$libnatpmp_prefix/include"
fi
LDFLAGS="$LDFLAGS -L$libnatpmp_prefix/lib"
CORE_LDFLAGS="$CORE_LDFLAGS -L$libnatpmp_prefix/lib"
fi
;;
esac
@ -787,8 +789,8 @@ case $host in
esac
fi
AX_CHECK_LINK_FLAG([-Wl,-headerpad_max_install_names], [LDFLAGS="$LDFLAGS -Wl,-headerpad_max_install_names"], [], [$LDFLAG_WERROR])
CPPFLAGS="$CPPFLAGS -DMAC_OSX -DOBJC_OLD_DISPATCH_PROTOTYPES=0"
AX_CHECK_LINK_FLAG([-Wl,-headerpad_max_install_names], [CORE_LDFLAGS="$CORE_LDFLAGS -Wl,-headerpad_max_install_names"], [], [$LDFLAG_WERROR])
CORE_CPPFLAGS="$CORE_CPPFLAGS -DMAC_OSX -DOBJC_OLD_DISPATCH_PROTOTYPES=0"
OBJCXXFLAGS="$CXXFLAGS"
;;
*android*)
@ -851,11 +853,17 @@ if test "$use_lcov" = "yes"; then
AC_SUBST(COV_TOOL_WRAPPER, "cov_tool_wrapper.sh")
LCOV="$LCOV --gcov-tool $(pwd)/$COV_TOOL_WRAPPER"
AX_CHECK_LINK_FLAG([--coverage], [LDFLAGS="$LDFLAGS --coverage"],
AX_CHECK_LINK_FLAG([--coverage], [CORE_LDFLAGS="$CORE_LDFLAGS --coverage"],
[AC_MSG_ERROR([lcov testing requested but --coverage linker flag does not work])])
AX_CHECK_COMPILE_FLAG([--coverage],[CXXFLAGS="$CXXFLAGS --coverage"],
AX_CHECK_COMPILE_FLAG([--coverage],[CORE_CXXFLAGS="$CORE_CXXFLAGS --coverage"],
[AC_MSG_ERROR([lcov testing requested but --coverage flag does not work])])
CXXFLAGS="$CXXFLAGS -Og"
dnl If coverage is enabled, and the user hasn't overriden CXXFLAGS, clear
dnl them, to prevent autoconfs "-g -O2" being added. Otherwise we'd end up
dnl with "--coverage -Og -O0 -g -O2".
if test "$CXXFLAGS_overridden" = "no"; then
CXXFLAGS=""
fi
CORE_CXXFLAGS="$CORE_CXXFLAGS -Og -O0"
fi
if test "$use_lcov_branch" != "no"; then
@ -878,13 +886,13 @@ AC_FUNC_STRERROR_R
if test "$ac_cv_sys_file_offset_bits" != "" &&
test "$ac_cv_sys_file_offset_bits" != "no" &&
test "$ac_cv_sys_file_offset_bits" != "unknown"; then
CPPFLAGS="$CPPFLAGS -D_FILE_OFFSET_BITS=$ac_cv_sys_file_offset_bits"
CORE_CPPFLAGS="$CORE_CPPFLAGS -D_FILE_OFFSET_BITS=$ac_cv_sys_file_offset_bits"
fi
if test "$ac_cv_sys_large_files" != "" &&
test "$ac_cv_sys_large_files" != "no" &&
test "$ac_cv_sys_large_files" != "unknown"; then
CPPFLAGS="$CPPFLAGS -D_LARGE_FILES=$ac_cv_sys_large_files"
CORE_CPPFLAGS="$CORE_CPPFLAGS -D_LARGE_FILES=$ac_cv_sys_large_files"
fi
AC_SEARCH_LIBS([clock_gettime],[rt])
@ -968,8 +976,8 @@ dnl These flags are specific to ld64, and may cause issues with other linkers.
dnl For example: GNU ld will interpret -dead_strip as -de and then try and use
dnl "ad_strip" as the symbol for the entry point.
if test "$TARGET_OS" = "darwin"; then
AX_CHECK_LINK_FLAG([-Wl,-dead_strip], [LDFLAGS="$LDFLAGS -Wl,-dead_strip"], [], [$LDFLAG_WERROR])
AX_CHECK_LINK_FLAG([-Wl,-dead_strip_dylibs], [LDFLAGS="$LDFLAGS -Wl,-dead_strip_dylibs"], [], [$LDFLAG_WERROR])
AX_CHECK_LINK_FLAG([-Wl,-dead_strip], [CORE_LDFLAGS="$CORE_LDFLAGS -Wl,-dead_strip"], [], [$LDFLAG_WERROR])
AX_CHECK_LINK_FLAG([-Wl,-dead_strip_dylibs], [CORE_LDFLAGS="$CORE_LDFLAGS -Wl,-dead_strip_dylibs"], [], [$LDFLAG_WERROR])
AX_CHECK_LINK_FLAG([-Wl,-bind_at_load], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-bind_at_load"], [], [$LDFLAG_WERROR])
fi
@ -1297,7 +1305,7 @@ if test "$enable_fuzz" = "yes"; then
AX_CHECK_LINK_FLAG(
[-fsanitize=$use_sanitizers],
[AC_MSG_RESULT([no])],
[AC_MSG_RESULT([yes]); CPPFLAGS="$CPPFLAGS -DPROVIDE_FUZZ_MAIN_FUNCTION"],
[AC_MSG_RESULT([yes]); CORE_CPPFLAGS="$CORE_CPPFLAGS -DPROVIDE_FUZZ_MAIN_FUNCTION"],
[],
[AC_LANG_PROGRAM([[
#include <cstdint>
@ -1321,7 +1329,7 @@ else
QT_TEST_INCLUDES=SUPPRESS_WARNINGS($QT_TEST_INCLUDES)
fi
CPPFLAGS="$CPPFLAGS -DPROVIDE_FUZZ_MAIN_FUNCTION"
CORE_CPPFLAGS="$CORE_CPPFLAGS -DPROVIDE_FUZZ_MAIN_FUNCTION"
fi
if test "$enable_wallet" != "no"; then
@ -1513,7 +1521,7 @@ AM_CONDITIONAL([ENABLE_SYSCALL_SANDBOX], [test "$use_syscall_sandbox" != "no"])
dnl Check for reduced exports
if test "$use_reduce_exports" = "yes"; then
AX_CHECK_COMPILE_FLAG([-fvisibility=hidden], [CXXFLAGS="$CXXFLAGS -fvisibility=hidden"],
AX_CHECK_COMPILE_FLAG([-fvisibility=hidden], [CORE_CXXFLAGS="$CORE_CXXFLAGS -fvisibility=hidden"],
[AC_MSG_ERROR([Cannot set hidden symbol visibility. Use --disable-reduce-exports.])], [$CXXFLAG_WERROR])
AX_CHECK_LINK_FLAG([-Wl,--exclude-libs,ALL], [RELDFLAGS="-Wl,--exclude-libs,ALL"], [], [$LDFLAG_WERROR])
fi
@ -1874,6 +1882,9 @@ AC_SUBST(BITCOIN_MP_NODE_NAME)
AC_SUBST(BITCOIN_MP_GUI_NAME)
AC_SUBST(RELDFLAGS)
AC_SUBST(CORE_LDFLAGS)
AC_SUBST(CORE_CPPFLAGS)
AC_SUBST(CORE_CXXFLAGS)
AC_SUBST(DEBUG_CPPFLAGS)
AC_SUBST(WARN_CXXFLAGS)
AC_SUBST(NOWARN_CXXFLAGS)
@ -2005,9 +2016,9 @@ echo " build os = $build_os"
echo
echo " CC = $CC"
echo " CFLAGS = $PTHREAD_CFLAGS $CFLAGS"
echo " CPPFLAGS = $DEBUG_CPPFLAGS $HARDENED_CPPFLAGS $CPPFLAGS"
echo " CPPFLAGS = $DEBUG_CPPFLAGS $HARDENED_CPPFLAGS $CORE_CPPFLAGS $CPPFLAGS"
echo " CXX = $CXX"
echo " CXXFLAGS = $LTO_CXXFLAGS $DEBUG_CXXFLAGS $HARDENED_CXXFLAGS $WARN_CXXFLAGS $NOWARN_CXXFLAGS $ERROR_CXXFLAGS $GPROF_CXXFLAGS $CXXFLAGS"
echo " LDFLAGS = $LTO_LDFLAGS $PTHREAD_LIBS $HARDENED_LDFLAGS $GPROF_LDFLAGS $LDFLAGS"
echo " CXXFLAGS = $LTO_CXXFLAGS $DEBUG_CXXFLAGS $HARDENED_CXXFLAGS $WARN_CXXFLAGS $NOWARN_CXXFLAGS $ERROR_CXXFLAGS $GPROF_CXXFLAGS $CORE_CXXFLAGS $CXXFLAGS"
echo " LDFLAGS = $LTO_LDFLAGS $PTHREAD_LIBS $HARDENED_LDFLAGS $GPROF_LDFLAGS $CORE_LDFLAGS $LDFLAGS"
echo " ARFLAGS = $ARFLAGS"
echo

6
src/Makefile.am
View file

@ -8,9 +8,9 @@ print-%: FORCE
DIST_SUBDIRS = secp256k1
AM_LDFLAGS = $(LIBTOOL_LDFLAGS) $(HARDENED_LDFLAGS) $(GPROF_LDFLAGS) $(SANITIZER_LDFLAGS) $(LTO_LDFLAGS)
AM_CXXFLAGS = $(DEBUG_CXXFLAGS) $(HARDENED_CXXFLAGS) $(WARN_CXXFLAGS) $(NOWARN_CXXFLAGS) $(ERROR_CXXFLAGS) $(GPROF_CXXFLAGS) $(SANITIZER_CXXFLAGS) $(LTO_CXXFLAGS)
AM_CPPFLAGS = $(DEBUG_CPPFLAGS) $(HARDENED_CPPFLAGS)
AM_LDFLAGS = $(LIBTOOL_LDFLAGS) $(HARDENED_LDFLAGS) $(GPROF_LDFLAGS) $(SANITIZER_LDFLAGS) $(LTO_LDFLAGS) $(CORE_LDFLAGS)
AM_CXXFLAGS = $(DEBUG_CXXFLAGS) $(HARDENED_CXXFLAGS) $(WARN_CXXFLAGS) $(NOWARN_CXXFLAGS) $(ERROR_CXXFLAGS) $(GPROF_CXXFLAGS) $(SANITIZER_CXXFLAGS) $(LTO_CXXFLAGS) $(CORE_CXXFLAGS)
AM_CPPFLAGS = $(DEBUG_CPPFLAGS) $(HARDENED_CPPFLAGS) $(CORE_CPPFLAGS)
AM_LIBTOOLFLAGS = --preserve-dup-deps
PTHREAD_FLAGS = $(PTHREAD_CFLAGS) $(PTHREAD_LIBS)
EXTRA_LIBRARIES =