From c88873d3a48127eb6252faf586a0026b091e3628 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Tue, 20 Jun 2006 05:59:16 +0000 Subject: (gl_IGNORE_UNUSED_LIBRARIES): Use -Wl,--as-needed, not bare --as-needed, since HP-UX 11.11 cc merely issues a bunch of annoying warnings for --as-needed (this problem was reported by Bob Proulx). Also, try linking with -lm to detect a bug in binutils 2.16 (this problem was reported by Ralf Wildenhues). --- m4/ChangeLog | 5 +++++ m4/lib-ignore.m4 | 14 ++++++++++++-- 2 files changed, 17 insertions(+), 2 deletions(-) (limited to 'm4') diff --git a/m4/ChangeLog b/m4/ChangeLog index 8ad70a2ee..f31ec45f7 100644 --- a/m4/ChangeLog +++ b/m4/ChangeLog @@ -3,6 +3,11 @@ * lib-ignore.m4 (gl_IGNORE_UNUSED_LIBRARIES): Prefer binutils's --as-needed option if available. Problem reported by Albert Chin in . + However, use -Wl,--as-needed, not bare --as-needed, since HP-UX 11.11 + cc merely issues a bunch of annoying warnings for --as-needed + (this problem was reported by Bob Proulx). Also, try linking with + -lm to detect a bug in binutils 2.16 (this problem was reported + by Ralf Wildenhues). 2006-06-18 Jim Meyering diff --git a/m4/lib-ignore.m4 b/m4/lib-ignore.m4 index deaaee8e6..e518f8113 100644 --- a/m4/lib-ignore.m4 +++ b/m4/lib-ignore.m4 @@ -13,12 +13,21 @@ AC_DEFUN([gl_IGNORE_UNUSED_LIBRARIES], [gl_cv_ignore_unused_libraries], [gl_cv_ignore_unused_libraries=none gl_saved_ldflags=$LDFLAGS + gl_saved_libs=$LIBS + # Link with -lm to detect binutils 2.16 bug with --as-needed; see + # . + LIBS="$LIBS -lm" # Use long option sequences like '-z ignore' to test for the feature, # to forestall problems with linkers that have -z, -i, -g, -n, etc. flags. + # GCC + binutils likes '-Wl,--as-needed'. + # GCC + Solaris ld likes '-Wl,-z,ignore'. + # Sun C likes '-z ignore'. + # Don't try bare '--as-needed'; nothing likes it and the HP-UX 11.11 + # native cc issues annoying warnings and then ignores it, + # which would cause us to incorrectly conclude that it worked. for gl_flags in \ '-Wl,--as-needed' \ '-Wl,-z,ignore' \ - '--as-needed' \ '-z ignore' do LDFLAGS="$gl_flags $LDFLAGS" @@ -26,7 +35,8 @@ AC_DEFUN([gl_IGNORE_UNUSED_LIBRARIES], [gl_cv_ignore_unused_libraries=$gl_flags]) LDFLAGS=$gl_saved_ldflags test "$gl_cv_ignore_unused_libraries" != none && break - done]) + done + LIBS=$gl_saved_libs]) test "$gl_cv_ignore_unused_libraries" != none && LDFLAGS="$LDFLAGS $gl_cv_ignore_unused_libraries" -- cgit v1.2.3-70-g09d2