[LINKER] Add single underscore to all definitions, no -D for dashed param.

This makes possibility for the script to append the definitions to CFLAGS
and LDFLAGS, and with the feature of disabling of -D prependation it will
make possible to generate ARCH_FLAGS generic to each specific chip.

ld/README

@@ -90,7 +90,10 @@ Line description:
           "+"   - Don't change the parent. Use for split long line to two.
 
   <data>: space-separated list of preprocessor symbols supplied to the linker.
-      -D option name is automatically prepended to each symbol definition
+      -D option name with single underscore is automatically prepended to each
+         symbol definition
+      if the symbol starts with dash "-", it is interpreted as parameter to
+      linker, and no -D or underscore is generated.
 
 All lines starting with # symbol are treated as Comments
 
@@ -118,14 +121,15 @@ Example:
 
 --- devices.data file ---
 stm32f05[01]?4* stm32f0 ROM=16K RAM=4K
-stm32f0 stm32 ROM_OFF=0x08000000 RAM_OFF=0x20000000
+stm32f0 stm32 ROM_OFF=0x08000000 RAM_OFF=0x20000000 -mcpu=cortex-m0 -mthumb
 stm32 END
 
 --- queried chip name ---
 stm32f051c4t6
 
 --- output of the awk script ---
--DROM=16K -DRAM=4K -DROM_OFF=0x08000000 -DRAM_OFF=0x20000000
+-D_ROM=16K -D_RAM=4K -D_ROM_OFF=0x08000000 -D_RAM_OFF=0x20000000 \
+-mcpu=cortex-m0 -mthumb
 
 The generated linker script file will contain sections rom and ram with 
 appropriate initialization code, specified in linker file source linker.ld.S

ld/linker.ld.S

@@ -30,31 +30,34 @@ ENTRY(reset_handler)
 MEMORY
 {
 	/* RAM is always used */
-	ram (rwx) : ORIGIN = RAM_OFF, LENGTH = RAM
+	ram (rwx) : ORIGIN = _RAM_OFF, LENGTH = _RAM
 
-#if defined(ROM)
+#if defined(_ROM)
-	rom (rx) : ORIGIN = ROM_OFF, LENGTH = ROM
+	rom (rx) : ORIGIN = _ROM_OFF, LENGTH = _ROM
 #endif
-#if defined(ROM2)
+#if defined(_ROM1)
-	rom2 (rx) : ORIGIN = ROM2_OFF, LENGTH = ROM2
+	rom1 (rx) : ORIGIN = _ROM1_OFF, LENGTH = _ROM1
 #endif
-#if defined(RAM1)
+#if defined(_ROM2)
-	ram1 (rwx) : ORIGIN = RAM1_OFF, LENGTH = RAM1
+	rom2 (rx) : ORIGIN = _ROM2_OFF, LENGTH = _ROM2
 #endif
-#if defined(RAM2)
+#if defined(_RAM1)
-	ram2 (rwx) : ORIGIN = RAM2_OFF, LENGTH = RAM2
+	ram1 (rwx) : ORIGIN = _RAM1_OFF, LENGTH = _RAM1
 #endif
-#if defined(CCM)
+#if defined(_RAM2)
-	ccm (rwx) : ORIGIN = CCM_OFF, LENGTH = CCM
+	ram2 (rwx) : ORIGIN = _RAM2_OFF, LENGTH = _RAM2
 #endif
-#if defined(EEP)
+#if defined(_CCM)
-	eep (r) : ORIGIN = EEP_OFF, LENGTH = EEP
+	ccm (rwx) : ORIGIN = _CCM_OFF, LENGTH = _CCM
 #endif
-#if defined(XSRAM)
+#if defined(_EEP)
-	xsram (rw) : ORIGIN = XSRAM_OFF, LENGTH = XSRAM
+	eep (r) : ORIGIN = _EEP_OFF, LENGTH = _EEP
 #endif
-#if defined(XDRAM)
+#if defined(_XSRAM)
-	xdram (rw) : ORIGIN = XDRAM_OFF, LENGTH = XDRAM
+	xsram (rw) : ORIGIN = _XSRAM_OFF, LENGTH = _XSRAM
+#endif
+#if defined(_XDRAM)
+	xdram (rw) : ORIGIN = _XDRAM_OFF, LENGTH = _XDRAM
 #endif
 }
 
@@ -124,42 +127,42 @@ SECTIONS
 		_ebss = .;
 	} >ram
 
-#if defined(EEP)
+#if defined(_EEP)
 	.eep : {
 		*(.eeprom*)
 		. = ALIGN(4);
 	} >eep
 #endif
 
-#if defined(CCM)
+#if defined(_CCM)
 	.ccm : {
 		*(.ccmram*)
 		. = ALIGN(4);
 	} >ccm
 #endif
 
-#if defined(RAM1)
+#if defined(_RAM1)
 	.ram1 : {
 		*(.ram1*)
 		. = ALIGN(4);
 	} >ram1
 #endif
 
-#if defined(RAM2)
+#if defined(_RAM2)
 	.ram2 : {
 		*(.ram2*)
 		. = ALIGN(4);
 	} >ram2
 #endif
 
-#if defined(XSRAM)
+#if defined(_XSRAM)
 	.xsram : {
 		*(.xsram*)
 		. = ALIGN(4);
 	} >xsram
 #endif
 
-#if defined(XDRAM)
+#if defined(_XDRAM)
 	.xdram : {
 		*(.xdram*)
 		. = ALIGN(4);

ld/tests/dash.data

@@ -0,0 +1 @@
+dash END A B C D -mcpu=cortex-m0

ld/tests/dash.result

@@ -0,0 +1 @@
+-D_A -D_B -D_C -D_D -mcpu=cortex-m0 

ld/tests/longline.result

@@ -1 +1 @@
--DA=parameter -DB=parameter -DC=parameter -DD=parameter -DE==parameter -DF=parameter -DG=parameter 
+-D_A=parameter -D_B=parameter -D_C=parameter -D_D=parameter -D_E==parameter -D_F=parameter -D_G=parameter 

ld/tests/single.result

@@ -1 +1 @@
--DA -DB -DC -DD 
+-D_A -D_B -D_C -D_D 

ld/tests/tree1.result

@@ -1 +1 @@
--DA -DB -DC -DD -DE -DF 
+-D_A -D_B -D_C -D_D -D_E -D_F 

ld/tests/tree5.result

@@ -1 +1 @@
--DA -DB -DC -DD -DE -DF 
+-D_A -D_B -D_C -D_D -D_E -D_F 

ld/tests/twomatch.result

@@ -1 +1 @@
--DA -DB -DC -DD -DE -DF 
+-D_A -D_B -D_C -D_D -D_E -D_F 

scripts/genlink.awk

@@ -38,8 +38,12 @@ BEGIN {
 		if ($2 != "+")
 			PAT=$2;
 
-		for (i = 3; i <= NF; i = i + 1)
+		for (i = 3; i <= NF; i = i + 1) {
-			printf "-D%s ",$i;
+			if ($i ~ /^-/)
+				printf "%s ",$i;
+			else
+				printf "-D_%s ",$i;
+		}
 
 		if (PAT=="END")
 			exit;