Bug 195649 – media-libs/raptor-1.4.16 fails to build - need for libmath -lm gcc option

• Product: Gentoo Linux
• Status: RESOLVED FIXED

[Description Jan Bessai 2007-10-12 18:28:37 UTC]

On my ~AMD64 Gentoo media-libs/raptor-1.4.16 fails to build. Error occurs with -uD world and revdep-rebuild.
According to Google the error is a missing -lm (libmath) link flag for gcc.
See also: http://forums.gentoo.org/viewtopic-t-598109.html

Reproducible: Always

Steps to Reproduce:
1.# emerge raptor-1.4.16

Actual Results:  

/bin/sh ../libtool --tag=CC   --mode=link x86_64-pc-linux-gnu-gcc  -O3 -march=nocona -fomit-frame-pointer -pipe -mmmx -msse -msse2 -mfpmath=sse -ftree-vectorize   -o rapper rapper.o  ../src/libraptor.la -lexpat
mkdir .libs
x86_64-pc-linux-gnu-gcc -O3 -march=nocona -fomit-frame-pointer -pipe -mmmx -msse -msse2 -mfpmath=sse -ftree-vectorize -o .libs/rapper rapper.o  ../src/.libs/libraptor.so /usr/lib64/libexpat.so
../src/.libs/libraptor.so: undefined reference to `trunc'
../src/.libs/libraptor.so: undefined reference to `round'
../src/.libs/libraptor.so: undefined reference to `fmod'
../src/.libs/libraptor.so: undefined reference to `pow'
collect2: ld returned 1 exit status

[Comment 1 Matteo Azzali (RETIRED) 2007-10-13 10:49:40 UTC]

Created attachment 133320 [details]
raptor-1.4.16.ebuild

Proposed ebuild:
Working on X86 (it had the same issue here).
I just used flag-o-matic and added "append-ldflags -lm"
line at start of src_compile()

[Comment 2 Alexis Ballier 2007-10-13 10:52:27 UTC]

(In reply to comment #1)

> I just used flag-o-matic and added "append-ldflags -lm"

wont that fail with --as-needed ?

[Comment 3 Matteo Azzali (RETIRED) 2007-10-13 11:37:44 UTC]

Comment on attachment 133320 [details]
raptor-1.4.16.ebuild

That's the way suggested at:
http://devmanual.gentoo.org/ebuild-writing/functions/src_compile/build-environment/index.html

However you're right according to:
http://www.gentoo.org/proj/en/qa/asneeded.xml
the -lm flag is no more inserted with append-ldflags, checking what other did.

[Comment 4 Matteo Azzali (RETIRED) 2007-10-13 12:01:45 UTC]

Created attachment 133324 [details, diff]
raptor-lm.patch

I don't know how much it's hackish, but this for sure avoid putting -lm
before --as-needed.

[Comment 5 Alexis Ballier 2007-10-13 13:18:26 UTC]

should be fixed now, I just appended -lm to LIBS variable which is used for linking.

also sent a different patch upstream

[Comment 6 Jakub Moc (RETIRED) 2007-10-13 22:06:18 UTC]

*** Bug 195738 has been marked as a duplicate of this bug. ***