Build error

[dbermond]

I'm getting the following error when trying to build firetools 0.9.62:

g++ -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -lrt -Wl,-z,relro -Wl,-z,now -Wl,-O1 -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -o ../../build/fstats main.o stats_dialog.o pid_thread.o db.o dbpid.o graph.o utils.o pid.o config.o qrc_fstats.o moc_pid_thread.o moc_stats_dialog.o   /usr/lib/libQt5Widgets.so /usr/lib/libQt5Gui.so /usr/lib/libQt5Core.so -lGL -lpthread -lmd4c   
/usr/bin/ld: stats_dialog.o: undefined reference to symbol 'shm_open@@GLIBC_2.2.5'
/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/librt.so: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:182: ../../build/fstats] Error 1
make[2]: Leaving directory '/build/firetools/src/firetools-0.9.62/src/fstats'
make[1]: *** [Makefile:5: fstats] Error 2
make[1]: Leaving directory '/build/firetools/src/firetools-0.9.62/src'
make: *** [Makefile:17: src] Error 2

• This is caused by commit 15a4571.

• Reverting commit 15a4571 "fixes" the issue.

• Executing export LDFLAGS="-lrt ${LDFLAGS}" before building also "fixes" this issue.

• System Information:

  • OS: Arch Linux x86_64
  • compiler: gcc 9.2.0
  • Qt: 5.14.0 (qmake: 3.1)

[darix]

Try this patch. It fixes the build for me on openSUSE Tumbleweed:

Index: firetools-0.9.62/src/fstats/fstats.pro
===================================================================
--- firetools-0.9.62.orig/src/fstats/fstats.pro
+++ firetools-0.9.62/src/fstats/fstats.pro
@@ -1,6 +1,7 @@
 QMAKE_CXXFLAGS += $$(CXXFLAGS) -fstack-protector-all -D_FORTIFY_SOURCE=2 -fPIE -pie -Wformat -Wformat-security
 QMAKE_CFLAGS += $$(CFLAGS) -fstack-protector-all -D_FORTIFY_SOURCE=2 -fPIE -pie -Wformat -Wformat-security
-QMAKE_LFLAGS += $$(LDFLAGS) -lrt -Wl,-z,relro -Wl,-z,now
+QMAKE_LFLAGS += $$(LDFLAGS) -Wl,-z,relro -Wl,-z,now
+LIBS= -lrt -lc
 QT += widgets
  HEADERS       = ../common/utils.h ../common/pid.h ../common/common.h \
  		  pid_thread.h db.h dbstorage.h dbpid.h stats_dialog.h graph.h fstats.h

Explanation why I moved the "-lrt" to LIBS ... it needs to be after the -o expression if you link with "as-needed"

[dbermond]

This patch fixes the issue for me. Git master is also building fine for me now.

Thank you for working on this.

[reinerh]

Hm, it builds fine in Debian with Qt 5.12 / gcc 9.2.
I'm wondering why adding -lrt to QMAKE_LIBS does not work for you (-lc shouldn't be needed?).
Maybe they changed something in Qt 5.14?
@darix, could you please open a PR with your fix?