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| author | vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4> | 2019-01-30 09:19:01 +0000 |
|---|---|---|
| committer | vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4> | 2019-01-30 09:19:01 +0000 |
| commit | ab2279a252b70a62d3a9a26498df4799838f646f (patch) | |
| tree | 4cb850a968f77c68aac7b54f7f6430a32db67a80 /INSTALL | |
| parent | eac341fa573f6d0b775681a015333459227ca0fc (diff) | |
| download | mpfr-ab2279a252b70a62d3a9a26498df4799838f646f.tar.gz | |
Update about CC / CFLAGS settings from GMP (__GMP_CC / __GMP_CFLAGS).
* configure.ac: remove -pedantic unconditionally; since r7044, it was
removed only when logging was enabled, as at that time only logging
was using C extensions.
* NEWS: added a line about this change.
* INSTALL: updated the note about CC / CFLAGS, removing the obsolete
reference to GMP 4.3.0 at the same time.
git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@13421 280ebfd0-de03-0410-8827-d642c229c3f4
Diffstat (limited to 'INSTALL')
| -rw-r--r-- | INSTALL | 20 |
1 files changed, 13 insertions, 7 deletions
@@ -238,13 +238,19 @@ specific architecture. [1] http://permalink.gmane.org/gmane.comp.gnu.libtool.patches/10111 -Note: By default, the configure script tries to set CC/CFLAGS to GMP's -ones (this feature needs GMP 4.3.0 or later, or the --with-gmp-build -option). However this is not guaranteed to work as the configure script -does some compiler tests earlier, and the change may be too late. Also, -the values obtained from GMP may be incorrect if GMP has been built -on a different machine. In such a case, the user may need to specify -CC/CFLAGS as explained below. +Note: By default, the configure script tries to set CC / CFLAGS to GMP's +ones from gmp.h (__GMP_CC / __GMP_CFLAGS) in order to ensure that MPFR is +built with the same ABI as GMP. The reason is that when GMP is built, it +may set CC / CFLAGS to select an ABI that is not the default one in order +to have a better performance. The -pedantic option in GMP's CFLAGS, when +present (which is the case by default), is removed, because the MPFR +build system uses some C extensions (when this script detects that they +are supported) and -pedantic yields too many useless warnings. However, +this setting from GMP is not guaranteed to work as the configure script +does some compiler tests earlier, and a conflict may arise. Also, the +values obtained from GMP may be incorrect for the MPFR build if GMP has +been built on a different machine; in such a case, the user may need to +specify CC / CFLAGS, as explained below. Moreover, even without --with-gmp-build and --enable-gmp-internals, MPFR might use some GMP internals by mistake. This would be a bug, |